Ejector for a winding device

ABSTRACT

An ejector for a winding device on a sewing machine in which the device has a bobbin spindle protruding from the machine body and a sleeve or bushing encircling the spindle and associated with a hub journalled in a hole in the wall of the body concentrically with the bobbin spindle and rotatable by an arm protruding from the hub, wherein the sleeve or bushing is axially displacable and non-rotatably arranged within the hub and in mesh with the inside of the hub with threads to effect an axial, ejecting motion against a bobbin entered on the bobbin spindle, when the hub is rotated in a predetermined direction.

United States Patent Giesselmann Au 12 1975 [54] EJECTOR FOR A WINDING DEVICE 2,826.376 3/1958 Wallin 242/81 [75] Inventor: Hannes Giesselmann, Huskvarna, FOREIGN PATENTS OR APPLICATIONS Sweden 795,115 5/1958 United Kingdom 242/41 [73] Assignee: Husqvarna AB, Huskvarna, Sweden Primary Examiner-H. Hampton Hunter [22] filed: 1974 Attorney, Agent, or Firm-Holman & Stern [21] Appl. No.: 451,705

[57] ABSTRACT 30 Foreign Application priority Data An ejector for a winding device on a sewing machine Mar 16 1973 Sweden 73036931 in which the device has a bobbin spindle protruding from the machine body and a sleeve or bushing encir- [52] U S Cl 112/218 A cling the spindle and associated with a hub journalled [51] In} .032... .bOSB 59/04 in a hole in the Wall of the y concentrically with [58] Field of ;;;;1.'I1IIi....-II"1'15/5115 218 R, 220 the bbbin Spindle and rotatable by Protwding 112/221 219 242/20 22 23 24 41 from the hub, wherein the sleeve or bushing is axially displacable and non-rotatably arranged within the hub [56] References Cited and in mesh with the inside of the hub with threads to effect an axial, ejecting motion against a bobbin en- UNITED STATES PATENTS tered on the bobbin spindle, when the hub is rotated 2,592,516 4/1952 Hirsch 112/218 A i a predatermined di i 2,620,141 12/1952 Langbo 242/81 X 2,781,179 2/1957 OMalley 242/81 3 laims, 3 Dr wing Figures EJECTOR FOR A WINDING DEVICE BACKGROUND OF THE INVENTION The present invention relates to winding devices on sewing machines, in particular an operating mechanism for such devices, which facilitates the winding up of the lower thread on a bobbin.

PRIOR ART It has been known previously to disengage, by means of an operating mechanism inserted in a bobbin spindle, the drive of the machine proper, when a bobbin is placed on the spindle in question. This represents a substantial simplification of the winding process, since the disengagement of the machine may otherwise cause difficulties and trouble. A further simplification consists in the arrangement of a thread guide and a winding .director which prevents the winding of the bobbin being started in the wrong direction. The thread guide is an important detail when the winding takes place with the thread inserted in the machine, that is to say directly from the needle. The thread guide then holds the thread away from the machine body, so that a free thread run is obtained.

An operating mechanism inserted in the bobbin spindle has the disadvantage, however, that certain bobbins will be difficult to disengage from the spindle after the winding. It seems appropriate therefore, besides arranging a thread guide, also to use a disengaging device for the bobbin when the winding takes place.

OBJECT AND SUMMARY OF THE INVENTION It is the object of the present invention to provide a thread guide and clutch arm in a winding device which achieves a dual purpose, namely, on the one hand, to control the thread during the winding, and on the other hand, by a pivoting movement, disengage the bobbin from the bobbin spindle. Such a device will, according to the invention, be realized when one end of the arm is provided with a hub joumalled in the sewing machine body concentrically with a bobbin spindle protruding from the body, and that a sleeve or bushing encircling the spindle is associated with the inside of the hub by means of threads displacing the sleeve axially within the hub, when the arm is pivoted.

BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the device in accordance with the invention is described in the following with reference to the enclosed drawing, which shows in FIG. 1 the clutch arm for the winding device on a sewing machine,

FIG. 2 the clutch arm taken apart, and

FIG. 3 the clutch arm assembled.

DETAILED DESCRIPTION OF THE INVENTION The winding device is located at the side end of the machine stand 1 and a bobbin 3 may be placed onto a projecting bobbin spindle 2. The bobbin spindle has a slot in which is inserted a wedge 4 belonging to a freewheel between the spindle and an inner driving element which is in driving connection with the shafts of the machine. Such a wedge and freewheel are known in themselves and do not have to be explained here in detail.

In a wall 5 of the stand, a hole 6 (FIG. 2) is provided around the bobbin spindle in which is mounted an arm winding only anticlockwise, since the shield prevents the thread end from being placed in clockwise on the bobbin, when the same is inserted in the manner illustrated by FIG. 1.

The end of the arm is provided with a notch 12 and is in projecting position outside the body of the machine, so that the thread can pass freely from the needle of the sewing machine through the notch to the bobbin. The winding directly from the needle brings with it the advantage that the upper thread inserted in the machine can be used for winding of the lower thread, which represents a saving of time.

In the hub 8, a bushing 13 is inserted which has approximately the same outside diameter as the bobbin, The bushing has an axial groove 14 which slides towards the peg l0 and a pair of helical grooves 15 which correspond to an internal thread 16 in the hub. When the arm is pivoted, the thread slides in the groove 15, and since the bushing is prevented by the peg 10 from rotating the bushing is displaced axially in the hub. In FIG. 1, the bushing is in its inner position, with a bobbin being accommodated on the outside; in FIG. 3, the bushing is in its outer position. When the arm is pivoted from the position according to FIG. 1 to the position according to FIG. 3, the bushing 13 serves as an ejector for the bobbin.

The construction shown and described is to be regarded as an example of a realization of the invention. It is possible to think of variants of hub, ejector and bobbin spindle to replace those described in the foregoing without departing from the idea of the invention. It is possible, for example, to allow the arm movement to influence the freewheel of the machine during winding, so that the clutch element in the bobbin spindle can be left out. Such variants are included in the basic idea of the invention, as defined in the following claims.

What is claimed is:

1. An ejector for a winding device on a sewing machine having a body including a wall; the device including a bobbin spindle on said sewing machine protruding through a hole in the body and a bushing encircling the spindle; a hub including an arm extending outwardly therefrom joumaled over said bushing in said hole in the wall of the machine body concentrically with the bobbin spindle and rotatable by means of said arm; said wall and bushing including cooperating means for locking said bushing against rotation but permitting axial displacement of said bushing; said bushing and said hub including cooperating thread means for axially displacing said bushing with respect to said hub upon rotation of said hub, whereby to effect an axial, ejecting motion against a bobbin inserted on the bobbin spindle when the hub is rotated by said arm in a predetermined direction.

2. The ejector as claimed in claim 1 in which the arm protruding from the hub is in a projecting position outside the front wall of the machine body.

3. The ejector as claimed in claim 2 in which the bushing is axially displaced by the threads into an inner position within the hub providing a space for a bobbin on the spindle outside the bushing when the arm is pivoted into the projecting position, and axially displaced out of the hub when the arm is pivoted in said predetermined direction. 

1. An ejector for a winding device on a sewing machine having a body including a wall; the device including a bobbin spindle on said sewing machine protruding through a hole in the body and a bushing encircling the spindle; a hub including an arm extending outwardly therefrom journaled over said bushing in said hole in the wall of the machine body concentrically with the bobbin spindle and rotatable by means of said arm; said wall and bushing including cooperating means for locking said bushing against rotation but permitting axial displacement of said bushing; said bushing and said hub including cooperating thread means for axially displacing said bushing with respect to said hub upon rotation of said hub, whereby to effect an axial, ejecting motion against a bobbin inserted on the bobbin spindle when the hub is rotated by said arm in a predetermined direction.
 2. The ejector as claimed in claim 1 in which the arm protruding from the hub is in a projecting position outside the front wall of the machine body.
 3. The ejector as claimed in claim 2 in which the bushing is axially displaced by the threads into an inner position within the hub providing a space for a bobbin on the spindle outside the bushing when the arm is pivoted into the projecting position, and axially displaced out of the hub when the arm is pivoted in said predetermined direction. 